WARNING: locking bug in inet_send_prepare

Status: closed as dup on 2023/01/03 07:32
Subsystems: net
[Documentation on labels]
Fix commit: 0b2c59720e65 l2tp: close all race conditions in l2tp_tunnel_register()
First crash: 338d, last: 338d
Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
WARNING: locking bug in inet_autobind net C done error 103 338d 1661d
Discussions (4)
Title Replies (including bot) Last reply
[Patch net v3 0/2] l2tp: fix race conditions in l2tp_tunnel_register() 10 (10) 2023/01/17 10:57
[Patch net v2 0/2] l2tp: fix race conditions in l2tp_tunnel_register() 5 (5) 2023/01/12 13:18
[Patch net 0/2] l2tp: fix race conditions in l2tp_tunnel_register() 11 (11) 2023/01/10 06:49
[syzbot] WARNING: locking bug in inet_send_prepare 1 (2) 2023/01/03 07:32
Last patch testing requests (4)
Created Duration User Patch Repo Result
2023/01/05 07:21 19m net report log
2023/01/04 04:05 12m net report log
2023/01/03 16:30 13m net report log
2023/01/03 09:53 17m patch a5541c0811a0 report log

Sample crash report:
------------[ cut here ]------------
Looking for class "l2tp_sock" with key l2tp_socket_class, but found a different class "slock-AF_INET6" with the same key
WARNING: CPU: 0 PID: 24577 at kernel/locking/lockdep.c:940 look_up_lock_class+0x158/0x160
Modules linked in:
CPU: 0 PID: 24577 Comm: syz-executor105 Not tainted 6.1.0-rc8-syzkaller-33330-ga5541c0811a0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : look_up_lock_class+0x158/0x160
lr : look_up_lock_class+0x154/0x160 kernel/locking/lockdep.c:937
sp : ffff800014a7b980
x29: ffff800014a7b980 x28: 0000000000000000 x27: 0000000000000000
x26: ffff0000d0864bb0 x25: ffff80000b22ff14 x24: 0000000000000000
x23: ffff80000eec8000 x22: 0000000000000001 x21: ffff80000f1c3018
x20: 0000000000000000 x19: ffff80000dc27c18 x18: 0000000000000000
x17: 6f6620747562202c x16: 7373616c635f7465 x15: 6b636f735f707432
x14: 6c2079656b206874 x13: 205d373735343254 x12: 5b5d313634303832
x11: ff808000081c4d64 x10: 0000000000000000 x9 : ad3022ef6adb7200
x8 : ad3022ef6adb7200 x7 : 545b5d3136343038 x6 : ffff80000c091ebc
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000100000201 x0 : ffff80000dc27c18
Call trace:
 register_lock_class+0x4c/0x2f8 kernel/locking/lockdep.c:1289
 __lock_acquire+0xa8/0x3084 kernel/locking/lockdep.c:4934
 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5668
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
 _raw_spin_lock_bh+0x54/0x6c kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:355 [inline]
 lock_sock_nested+0x88/0xd8 net/core/sock.c:3450
 lock_sock include/net/sock.h:1721 [inline]
 inet_autobind net/ipv4/af_inet.c:177 [inline]
 inet_send_prepare+0x70/0xf4 net/ipv4/af_inet.c:813
 inet6_sendmsg+0x30/0x80 net/ipv6/af_inet6.c:660
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 __sys_sendto+0x1e4/0x280 net/socket.c:2117
 __do_sys_sendto net/socket.c:2129 [inline]
 __se_sys_sendto net/socket.c:2125 [inline]
 __arm64_sys_sendto+0x30/0x44 net/socket.c:2125
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584
irq event stamp: 162
hardirqs last  enabled at (161): [<ffff800008038a7c>] local_daif_restore arch/arm64/include/asm/daifflags.h:75 [inline]
hardirqs last  enabled at (161): [<ffff800008038a7c>] el0_svc_common+0x40/0x220 arch/arm64/kernel/syscall.c:107
hardirqs last disabled at (160): [<ffff80000c0844f4>] el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
softirqs last  enabled at (156): [<ffff80000801c82c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (162): [<ffff80000b22ff14>] spin_lock_bh include/linux/spinlock.h:355 [inline]
softirqs last disabled at (162): [<ffff80000b22ff14>] lock_sock_nested+0x88/0xd8 net/core/sock.c:3450
---[ end trace 0000000000000000 ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/12/29 08:06 git:// for-kernelci a5541c0811a0 44712fbc .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING: locking bug in inet_send_prepare
* Struck through repros no longer work on HEAD.